If a player already controls a Field Spell Card, the existing Field Spell Card will be sent to the Graveyard immediately before that player activates another Field Spell Card.

A monster will be sent to the Graveyard after its Summon is negated, if it has not already been moved somewhere.

If a monster would be Summoned, but there is no free Monster Zone for it. (For example, "Juragedo" activates its effect to Special Summon itself, but "Ojama Trio" is chained so that there are no free Monster Zones when it resolves.)

Cards sent from the hand to the Graveyard are not necessarily discarded. For example, the effect of "The Fabled Cerburrel" activates when it is discarded to the Graveyard, so it will activate if discarded by "Card Destruction" but not when sent to the Graveyard by "Hand Destruction".

Likewise, cards sent from the field to the Graveyard are not necessarily destroyed. For example, the effect of "Dark End Dragon" sends monsters to the Graveyard, so it cannot be negated by cards such as "Stardust Dragon". However, doing so will activate the effects of "Sangan" and "Dandylion", which they activate when sent to the Graveyard, regardless of whether they were destroyed or not.